New lignicolous species Helminthosphaeria carpathica, H. mammillata and H.
pilifera, are described and illustrated. Diplococcium anamorphs are describ
ed and illustrated for the two latter species. No anamorph was observed for
H. carpathica. These species were collected on decayed wood of deciduous t
rees in the Czech Republic and Ukraine. A key to species of Helminthosphaer
ia is provided. Relationships of Helminthosphaeria with other genera of the
Helminthosphaeriaceae are discussed.